Forecasting, divination, mantic and fortune telling are often present in medieval law. But does the presence of this topic in the legal sources justify a conclusion to the practice? Did the individual texts actually react to contemporary practices or was it just that older traditional items were continually updated for reasons of legal system? The answer to this question also depends on the importance of prognostic practices in everyday life. In this volume, recognized scientists not only analyze the variance and continuity of the topic of prognosis in legal texts of early and high Middle Ages, but also ask about tradition and seat in life. The sources examined include collections of ecclesiastical and secular law, penance books and papal letters.